So, I realized the other day that Odysseus is changing his coloration -- not in a "I'm sick" kind of way -- he's getting more colorful. His head is now masked with the same vivid blue of his body. It's not quite complete -- he has a dark "skunk stripe" down the top of his head, but his face and lips and area around his eyes are now bright blue where before they were dark. He's now also developing red rings in his pectorals (consistent with his butterfly pattern) where before they were only white and blue.
I know that marble bettas can change their coloration dramatically and may keep changing their whole lives. I though marbles, however, always retained a spotted look that indicated they were marbles. Hence, I never though Odysseus could change his colors. Am I wrong? I know that dragonscale bettas can extend their colored scales on their faces (which is why they go blind, right), but Odysseus isn't pale like a dragon scale.
Can all bettas do this, or is Odysseus just a weird fish?
How have your bettas changed over time?